Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9056341 | Method for producing seamless tubes by means of a three-roll bar rolling mill | Rolf Kümmerling, Winfried Braun, Hidenori Kinugasa, Sasaki Kenichi | 2015-06-16 |
| 5115656 | Method and apparatus for manufacturing medium-walled and thin-walled seamless pipes | Rolf Kümmerling, Horst Biller | 1992-05-26 |
| 4848124 | Making seamless pipes, over 200 mm in diameter | Horst Biller, Wilhelm Nickel, Rolf Kuemmerling | 1989-07-18 |
| 4404832 | Operating a rolling mill working on seamless tubing | Gerd Pfeiffer, Horst Biller, Karl Oberem, Alfred Lampe, Hermann Josef Frentzen | 1983-09-20 |